Improvement in griping-blocks for presses



.ew e S S 8 .r DI* Ar.. 0 fl S Dk An. C 0 0 Rl .8. B n F. g N n D. Wpr... WG n .Gull ....l n B m e 0 W4 r.6 `0.]..` nw N 4Patented Sep.24,1872.

` @ummm GEORGE W. SWIN'EBROAD,

or BOLIVAR, TENNESSEE.

IMPROVEMENT N GRIPING-BLOCKSFOR PRESSES.

Specification forming part of Letters Patent No. 131,640, datedSeptember 24, 1872.

` To all whom it may concern.'

Be it known that I,- GEoRGE W. SWINE- BROAD, of Bolivar,'in the countyof Hardeman and State of Tennessee, have invented a new and usefulImprovement in'GripingBlocks, of which the following is a specification:

My invention consists of steel bars combined with the inner walls of thegripin gblocks in presses and other machines for gripin g hold ofstraight bars `passing through them by tilting on said bars, so as togripe and hold for working said bars short Vstages at a time by levers,the said steel bars being used in the parts most subject to wear toresist the i same, and because of the superior capacity of steel togripe thebars and retain its hold; also because they can be removed whenworn out and new pieces putin.

Figure l is a sectional elevation on line mm of Fig. 2 of a pair ofgriping-blocks arranged according to my improvement; also an elevationin dotted lines of some partsrof a press, showing the manner of usingthe said blocks. Fig. 2 is a horizontal section of one of the blocks onthe line yy of Fig. l.

Similar letters of reference indicate corresp on din g parts. y

A represents the said g'ripingblocks, which are used in pairs, one beingsuspended by alink, B, and hook U from the follower D, which is to bemoved, so that the strain being on one side of the block will cause itto tilt on the bar E passing through it, and thereby bind thereon. Theother block, having the same bar passing through it, is suspended inlike manner from the short end of a lever, F, by a hook, G, and thelever is suspended from the follower by alink, H.

follower, and then, as the latter springs back upon the reversing of thelever, it will gripe the bar and hold the follower from going back. l

I now propose to apply square or other suitably-shaped steel bars orblocks, I, to these griping-blocks, as shown, where the greatest wearcomes on the griping-surfaces to resist the wear and to maintainefficient griping edges at the corners of said blocks for acting on thebars. rEhe said steel blocks will be hardened and tempered to make themmore durable. Thus the efficiency of griping-blocks, of this characterwill be very greatly increased as compared with the ordinary cast-ironblocks which very soon wear away in the parts corresponding to my steelbars, and become worthless. Besides wearing very much longer than theordinary blocks, I can remove the steel Y pieces and substitute new onesas they wear out.

Having thus described my invention, I claim I as new and desire tosecure by LettersPatent- The combination, with griping-blocks A, ofsteel blocks I, arranged in the said blocks A, as represented, and so asto be removed and replaced by new ones, substantially as specified.

GEORGE WASHINGTON SWINEBROAD.

Witnesses:

GEo. G. BELL, 0. P. DUNCAN.

FFICE.

